(PhysOrg.com) -- Stanford researchers say that captcha security codes, asking Internet sign-up users to repeat a string of letters to prove the users are human, can be thwarted, and they have successfully defeated captcha ...

Anonymous, which briefly knocked the FBI and Justice Department websites offline in retaliation for the US shutdown of file-sharing site Megaupload, is a shadowy group of international hackers with no central hierarchy.

(AP) -- A hacker broke into the Twitter account of NBC News and sent out a handful of false tweets about a suspected hijacking and a plane attack at ground zero just days before the tenth anniversary of 9/11.

With an estimated 40 percent of the 100 million U.S. singles trying online dating, researchers at the University of Arkansas caution users that some Web sites’ claims of scientific justification may be “junk science.”